Music and Haircutting During Sefirah

-There are two minhagim of Aveilus during Sefirah. One minhag keeps Aveilus from after Pesach until Lag Ba’omer, and one minhag keeps Aveilus from Rosh Chodesh Iyar until Lag Ba’omer and from the day after Lag Ba’omer until Shavuos, (i.e. three days before Shavuos). Shulchan Aruch w/Mishnah Brurah 493:3

[Unless one is part of Kehilla (e.g. Chassidus) where everyone keeps one minhag, one may change which minhag he wishes to keep from year to year. SA 493:3, S’U Chasam Sofer 142, S’U Minchas Yitzchok 4:84]

-During the days of Sefirah we do not make weddings, listen to music (even pre-recorded on a CD or cassette tape), or cut hair (and shave – without a specific heter for work), because at this time 24,000 talmidim of Rebbi Akiva died; therefore we keep some minhagim of Aveilus. Shulchan Aruch w/Mishnah Brurah 493:1